Patrik Helsing
Engineering Manager, User Account Core at valid4j
Stockholm County, Sweden
Summary
👤
Senior🎓
Top SchoolPatrik Helsing is an accomplished engineering manager and software architect with three decades of experience building business-critical systems across MedTech and high-scale FinTech. He currently leads Klarna’s User Account Core, managing a distributed team and 24/7 operation of microservices that withstand flash crowds of 11,000 rps with sub-40ms P99 latency. Known for marrying technical strategy with business value, he has repeatedly driven modernization and consolidation efforts—cutting per-transaction infrastructure costs by half and migrating 50+ clients to a unified API. Patrik combines hands-on systems design (Java, AWS, Kafka, DynamoDB, Hadoop) with strong people leadership across international teams. His background in safety-critical medical systems informs a disciplined approach to resilience and risk that benefits high-throughput financial services. He also maintains open-source contributions (valid4j), reflecting a steady commitment to practical tooling and quality.
12 years of coding experience
19 years of employment as a software developer
Electrical engineering, Electrical engineering at RudbeckskolanMSc, Computer Science and Engineering, MSc, Computer Science and Engineering at Chalmers University of Technology
Github Skills (32)
assertion10
json-data10
jsonpath10
java10
dropwizard10
hibernate10
rest10
jax-rs10
jetty10
restful-api9
jersey9
json-parser9
json9
servlet9
validation9
Programming languages (2)
Github contributions (5)
valid4j/valid4j
Feb 2014 - Dec 2015
Simple assertion and validation library for Java
Contributions:119 commits, 18 pushes, 5 comments in 1 year 10 months
validationtestingvalidation-libraryassertionjava
valid4j/http-matchers
Dec 2015 - May 2016
Contributions:2 releases, 46 commits, 22 pushes in 4 months
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